Founders of Adi Dharm

The Adi Dharma Brahmic religion was originated by the Bengali Brahmin Thakur clan of Ram Mohan Roy, Dwarkanath Tagore and Prasanna Coomar Tagore who were Rarhi Brahmins of the Vandhopadyaya (Sandilya gotra) division.

This Adi Brahma religionAdi Dharma was originally propounded by these highest caste Kulin Brahmins
of Bengal who were excommunicated from Hindu faith for opposing social
and priestly evils of the time (18th and 19th century AD). Previously
the original ancestors (5 legendary Brahmin scholars of Kannauj Kanyakubja school deputed to the King of Bengal) of all these Highest caste twice born Bengali Brahmins had been excommunicated from Kannauj (Central Provinces) in 10th/11th cent. AD after their return from Bengal.

Mobility

"Mobility" ie. leaving the home and being exposed to external
influence meant loss of caste for Brahmins (a social device to conserve
meagre land holdings and priestly incomes).

Mobile scholars of priestly Brahmin clans such as these in contact
with (or in the service of) foreign rulers - like the Mughals or
European Companies or Indian princelings - were deliberately ostracised
by their "fixed" priestly Hindu clan peers (relatives) ensconced within
the numerous temples of Bengal and denied their shares of ancestral
undivided properties and incomes. As a consequence ghastly social evils
like Sati (or the burning alive of Hindu widows) were encouraged,
primarily by the fixed priestly class. The mobile clan members banded
into associations (Sabhas) to oppose these unBrahmic practices colliding head on with orthodox ("fixed") Hindu society in Bengal.

The Mughal 'Raja' Rammohun was the first Indian to cross the seas to
Britain in 1833, followed by 'Prince' Dwarkanath in 1842. Refusing to
recant and knowing that so strong was the prejudice against them at
home, both opted to die and be buried there.